Answer
$(-\infty,5]$.
The graph is shown below.
Work Step by Step
The given compound inequality is
$x\leq5$ or $x\leq1$.
First graph then take the union of the two inequality.
The graph is shown in the image file.
We can write the compound inequality.
$x\leq5$ as $(-\infty,5]$ and $x\leq1$ as $(-\infty,1]$
The union is
$(-\infty,5]\cup(-\infty,1]=(-\infty,5]$.
